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Compression Tools (Wikipedia) consists of software for compressing files & folders, backing up data and compressing email attachments, it is an ideal solution to save disk space. Besides, it also ensures faster file transfer over the Internet by sending compressed files. Compression tools can decompress files as well. If you download a compressed file, like .rar, .zip, or other formats, you'll need to decompress it.

Beside compressing/decompressing files, there are some extra highlight features included in shareware Automatic Backup Supports to automatically back up compressed files from different devices to hard drives or the cloud, e.g. compress photos stored in the camera and then back up the compressed file to PC.

Encryption Supports to encrypt compressed files

Sharing Supports to share compressed files via email or the cloud with one click

Freeware vs. Shareware

Freeware	Shareware
Lower data compression ratio and speed than shareware Less integrated additional functions than shareware	Advanced data compression algorithm ensures higher data compression ratio and speed Many practical additional functions, like splitting an archive into multiple parts, cloud backup, converting archive files etc.

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List all the popular Compression Tools. (including the best freeware)
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